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Re: toolchain for powerpc e500v2

Am 07.02.2011 um 16:53 schrieb Bryan Hundven:

> On Mon, Feb 7, 2011 at 7:51 AM, Bryan Hundven <> wrote:
>> On Mon, Feb 7, 2011 at 3:29 AM, David Brown <> wrote:
>>> On 07/02/2011 12:14, Titus von Boxberg wrote:
>>>> Am Mo, 7.02.2011, 11:16 schrieb David Brown:
>>>>> On 06/02/2011 12:48, Titus von Boxberg wrote:
>>>>>> Hi all,
>>>>>> I'm trying to use ct-ng (of approx. May 2010) to generate
>>>>>> cross gcc-4.5.1, glibc-2.9/linux for a powerpc e500v2 / SPE.
>>>>>> Setting floating point to "hardware" results in a build
>>>>>> error in glibc where the assembler complains while compiling
>>>>>> an FP file about an unmatched constraint
>>>>>> (I could try to get the original message if it helps).
>>>>>> The tool chain gets built when I set floating point support to
>>>>>> "software".
>>>>>> However, the resulting compiler does not emit hardware FP instructions
>>>>>> unless I give -mhard-float on the command line.
>>>>>> Is my assumption correct that setting floating point to "hardware" turns
>>>>>> on
>>>>>> code generation for the standard PowerPC FPU which this target lacks?
>>>>>> I'd like to avoid having a compiler which needs target specific flags
>>>>>> on the command line, thus:
>>>>>> Does anyone know which options to turn on to get a compiler that
>>>>>> emits correct SPE FP instructions without explicitly being told so
>>>>>> by -mhard-float?
>>>>>> Regards
>>>>>> Titus
>> Titus,
>> I use the e500v2 toolchain all the time. Please provide more info
>> about the build problem your having and what distribution/version you
>> are building on.
>> I am also hoping to have an e500mc (32 and 64-bit) toolchain samples soon.
Bryan, Yann, all,

glibc-2.9 now builds.
The settings required are
- hard fp in ct-ng
- disabling fp in glibc (--without-fp)
- possibly the assembler flag -Wa,e500x2 in CFLAGS
- patching away in a powerpc-makefile the rule to use
  CFLAGS+=-msoft-float when given --without-fp to configure

I did not test the result.
If you are interested in a more detailed description of the steps
I found nessecary, I'd start again from scratch and send you a
protocol of the errors without those steps.
I'd rather concentrate on eglibc because these problems and
(untested) solutions look a bit too weird for me.

Just let me know.


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